Teddy/swift2 2dependency fix (#451)
Teddy/swift2 2dependency fix (#451)

* Specified precise Starscream dependency for Swift 2.2 compatibility

* Made dependencies explicit

tad-iizuka/swift-sdk,tad-iizuka/swift-sdk,tad-iizuka/swift-sdk,watson-developer-cloud/ios-sdk,tad-iizuka/swift-sdk,tad-iizuka/swift-sdk,watson-developer-cloud/ios-sdk,watson-developer-cloud/ios-sdk,watson-developer-cloud/ios-sdk,watson-developer-cloud/ios-sdk